# C1.CalcEngine.ExpressionEngine.IExpressionEngine

## Content

<div class="doc-site-dotnet-api-container">



  <h1 id="C1_CalcEngine_ExpressionEngine_IExpressionEngine" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine" class="text-break">IExpressionEngine Interface
</h1>
  <div class="markdown level0 summary"><p>Defines properties and methods of expression engine.</p>
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  <div class="markdown level0 conceptual"></div>
  <h6><strong>Namespace</strong>: <a class="xref" href="C1.CalcEngine.ExpressionEngine.html">C1.CalcEngine.ExpressionEngine</a></h6>
  <h6><strong>Assembly</strong>: C1.CalcEngine.dll</h6>
  <h5 id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_syntax">Syntax</h5>
  <div class="codewrapper">
    <pre><code class="lang-csharp hljs">public interface IExpressionEngine</code></pre>
  </div>
  <div class="codewrapper">
    <pre><code class="lang-vbnet hljs">Public Interface IExpressionEngine</code></pre>
  </div>
  <h3 id="properties">Properties
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_CurrentIndex" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.CurrentIndex">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.CurrentIndex.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_CurrentIndex">CurrentIndex</a>
        </td>
        <td class="markdown level1 summary"><p>Gets or sets the index of the entry from data source.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_DataSource" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.DataSource">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.DataSource.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_DataSource">DataSource</a>
        </td>
        <td class="markdown level1 summary"><p>Gets the object used as the data source.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_Expression" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.Expression">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.Expression.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_Expression">Expression</a>
        </td>
        <td class="markdown level1 summary"><p>Gets or sets the expression string.</p>
</td>
      </tr>
    </tbody>
  </table>
  <h3 id="methods">Methods
</h3>
  <table class="table table-bordered table-condensed">
    <thead>
      <tr>
        <th>Name</th>
        <th>Description</th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_AddError_System_Int32_System_Int32_C1_CalcEngine_ErrorType_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.AddError(System.Int32,System.Int32,C1.CalcEngine.ErrorType)">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.AddError.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_AddError_System_Int32_System_Int32_C1_CalcEngine_ErrorType_">AddError(int, int, ErrorType)</a>
        </td>
        <td class="markdown level1 summary"><p>Adds an error to the error collection.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_ClearErrors" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.ClearErrors">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.ClearErrors.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_ClearErrors">ClearErrors()</a>
        </td>
        <td class="markdown level1 summary"><p>Clears parsing errors.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetErrors" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetErrors">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetErrors.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetErrors">GetErrors()</a>
        </td>
        <td class="markdown level1 summary"><p>Gets a enumerator of <a class="xref" href="C1.CalcEngine.ErrorInfo.html">ErrorInfo</a> objects.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetFieldNames" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetFieldNames">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetFieldNames.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetFieldNames">GetFieldNames()</a>
        </td>
        <td class="markdown level1 summary"><p>Gets the data source field names.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetItemsCount_C1_CalcEngine_ExpressionEngine_IExpression_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetItemsCount(C1.CalcEngine.ExpressionEngine.IExpression)">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetItemsCount.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetItemsCount_C1_CalcEngine_ExpressionEngine_IExpression_">GetItemsCount(IExpression)</a>
        </td>
        <td class="markdown level1 summary"><p>Gets a count of data source items.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetValue_System_Collections_Generic_IEnumerable_System_Object__" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetValue(System.Collections.Generic.IEnumerable{System.Object})">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.GetValue.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_GetValue_System_Collections_Generic_IEnumerable_System_Object__">GetValue(IEnumerable&lt;object&gt;)</a>
        </td>
        <td class="markdown level1 summary"><p>Gets a value from data source.</p>
</td>
      </tr>
      <tr>
        <td id="C1_CalcEngine_ExpressionEngine_IExpressionEngine_Parse_System_String_" data-uid="C1.CalcEngine.ExpressionEngine.IExpressionEngine.Parse(System.String)">
          <a class="xref" href="C1.CalcEngine.ExpressionEngine.IExpressionEngine.Parse.html#C1_CalcEngine_ExpressionEngine_IExpressionEngine_Parse_System_String_">Parse(string)</a>
        </td>
        <td class="markdown level1 summary"><p>Parses an expression.</p>
</td>
      </tr>
    </tbody>
  </table>

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